1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup rtems_bsd_machine |
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5 | * |
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6 | * @brief TODO. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2015 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Dornierstr. 4 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * Redistribution and use in source and binary forms, with or without |
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19 | * modification, are permitted provided that the following conditions |
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20 | * are met: |
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21 | * 1. Redistributions of source code must retain the above copyright |
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22 | * notice, this list of conditions and the following disclaimer. |
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23 | * 2. Redistributions in binary form must reproduce the above copyright |
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24 | * notice, this list of conditions and the following disclaimer in the |
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25 | * documentation and/or other materials provided with the distribution. |
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26 | * |
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27 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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28 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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29 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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30 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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31 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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32 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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33 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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34 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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35 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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36 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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37 | * SUCH DAMAGE. |
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38 | */ |
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39 | |
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40 | #ifndef _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_ |
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41 | #define _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_ |
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42 | |
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43 | /* |
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44 | * A page is a fixed size memory area of size PAGE_SIZE with the ability to |
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45 | * associate an object with it. The memory pool for pages has a fixed size and |
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46 | * is allocated during system initialization. This API is intended to be used |
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47 | * by ZONE(9). |
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48 | */ |
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49 | |
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50 | #include <sys/cdefs.h> |
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51 | #include <sys/param.h> |
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52 | #include <stdint.h> |
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53 | |
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54 | __BEGIN_DECLS |
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55 | |
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56 | extern void **rtems_bsd_page_object_table; |
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57 | |
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58 | extern uintptr_t rtems_bsd_page_area_begin; |
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59 | |
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60 | void *rtems_bsd_page_alloc(uintptr_t size_in_bytes, int wait); |
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61 | |
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62 | void rtems_bsd_page_free(void *addr); |
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63 | |
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64 | static inline void ** |
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65 | rtems_bsd_page_get_object_entry(void *addr) |
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66 | { |
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67 | uintptr_t a = (uintptr_t)addr; |
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68 | uintptr_t b = rtems_bsd_page_area_begin; |
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69 | uintptr_t s = PAGE_SHIFT; |
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70 | |
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71 | return (&rtems_bsd_page_object_table[(a - b) >> s]); |
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72 | } |
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73 | |
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74 | static inline void * |
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75 | rtems_bsd_page_get_object(void *addr) |
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76 | { |
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77 | void **obj_entry = rtems_bsd_page_get_object_entry(addr); |
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78 | |
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79 | return (*obj_entry); |
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80 | } |
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81 | |
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82 | static inline void |
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83 | rtems_bsd_page_set_object(void *addr, void *obj) |
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84 | { |
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85 | void **obj_entry = rtems_bsd_page_get_object_entry(addr); |
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86 | |
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87 | *obj_entry = obj; |
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88 | } |
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89 | |
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90 | __END_DECLS |
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91 | |
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92 | #endif /* _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_ */ |
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